go with the AEM SRI. it's more of an investment than anything. being able to reuse filters and avoiding $15.00 for a new air filter ever few oil changes really adds up. i got mine within a week of getting my car. i clean the filter 2 times a year and everything has more than paid for it's self.

don't believe the hype. SRI's generate only 2hp gains, CAI's generate 5hp if you're lucky. fighting for small HP gains is pretty pointless when you could achieve the same acceleration results by properly inflating your tires.